Ruby 1.3.1-990209 is out, check out:

    ftp://ftp.netlab.co.jp/pub/lang/ruby/in.coming/ruby-1.3.1-990209.tar.gz

md5sum is

    381e7326e86632e548e6655e34a19352  ruby-1.3.1-990209.tar.gz

Notice this is early access release, try it at your own risk.